Cleaning brush



FIG. 1 is the perspective view of this design;

FIG. 2 is the front elevation of this design;

FIG. 3 is the rear elevation of this design;

FIG. 4 is the top plan view of this design;

FIG. 5 is the underneath plan view of this design; and,

FIG. 6 is the right side elevation of this design. 

The ornamental design for a cleaning brush, as shown and described. 